Interrupt Assignments - Asus CROSSHAIR IV EXTREME User Manual

2.5.3

Interrupt assignments

Standard interrupt assignments
IRQ Priority
0
1
2
4
5
6
7
8
9
10
11
12
13
14
* These IRQs are usually available for PCI devices.
IRQ assignments for this motherboard
PCIE_X16_1
PCI_1
PCIE_X8 / X1_2
PCI_2
PCIE_X16 / X8_3
PCIE_X4_4
USB1 OHCI Controller
USB1 EHCI Controller
USB2 OHCI Controller
USB2 EHCI Controller
USB3 OHCI Controller
USB3 EHCI Controller
SB SATA/AHCI
Controller
LAN
1394
Audio
JMicron SATA
Controller
USB 3.0
2-24
Standard function
1 System Timer
2 Keyboard Controller
– Redirect to IRQ#9
12 Communications Port (COM1)*
13 IRQ Holder for PCI Steering*
14 Reserved
15 Reserved
3 System CMOS/Real Time Clock
4 IRQ Holder for PCI Steering*
5 IRQ Holder for PCI Steering*
6 IRQ Holder for PCI Steering*
7 Reserved
8 Numeric Data Processor
9 Primary IDE Channel
A
shared
–
–
–
shared
(X16/X8)
shared
–
– shared
–
– shared
–
– shared
–
–
–
shared
–
–
B C D
– – –
– – –
– – –
– – –
– – –
– – –
– shared –
– –
– shared –
– –
– shared –
– –
– – shared
– – shared
– – –
– – –
– – –
– – shared
E F
– –
shared –
shared
–
(X8)
– shared
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
shared –
– –
Chapter 2: Hardware information
G H
– –
– –
shared
–
(X1)
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
shared –
– –
– –
– –